<template>
    <div class="app-container">
        <switch-roles @change="handleRolesChange" />
        <div :key="key" style="margin-top:30px;">
            <div>
                <span v-permission="['admin']" class="permission-alert">
                    Only
                    <el-tag class="permission-tag" size="small">admin</el-tag> can see this
                </span>
                <el-tag v-permission="['admin']" class="permission-sourceCode" type="info">
                    v-permission="['admin']"
                </el-tag>
            </div>

            <div>
                <span v-permission="['editor']" class="permission-alert">
                    Only
                    <el-tag class="permission-tag" size="small">editor</el-tag> can see this
                </span>
                <el-tag v-permission="['editor']" class="permission-sourceCode" type="info">
                    v-permission="['editor']"
                </el-tag>
            </div>

            <div>
                <span v-permission="['admin','editor']" class="permission-alert">
                    Both
                    <el-tag class="permission-tag" size="small">admin</el-tag> and
                    <el-tag class="permission-tag" size="small">editor</el-tag> can see this
                </span>
                <el-tag v-permission="['admin','editor']" class="permission-sourceCode" type="info">
                    v-permission="['admin','editor']"
                </el-tag>
            </div>
        </div>

        <div :key="'checkPermission'+key" style="margin-top:60px;">
            <aside>
                In some cases, using v-permission will have no effect. For example: Element-UI's Tab component or el-table-column and other scenes that dynamically render dom. You can only do this with v-if.
                <br> e.g.
            </aside>

            <el-tabs type="border-card" style="width:550px;">
                <el-tab-pane v-if="checkPermission(['admin'])" label="Admin">
                    Admin can see this
                    <el-tag class="permission-sourceCode" type="info">
                        v-if="checkPermission(['admin'])"
                    </el-tag>
                </el-tab-pane>

                <el-tab-pane v-if="checkPermission(['editor'])" label="Editor">
                    Editor can see this
                    <el-tag class="permission-sourceCode" type="info">
                        v-if="checkPermission(['editor'])"
                    </el-tag>
                </el-tab-pane>

                <el-tab-pane v-if="checkPermission(['admin','editor'])" label="Admin-OR-Editor">
                    Both admin or editor can see this
                    <el-tag class="permission-sourceCode" type="info">
                        v-if="checkPermission(['admin','editor'])"
                    </el-tag>
                </el-tab-pane>
            </el-tabs>
        </div>
    </div>
</template>

<script>
import permission from "@/directive/permission/index.js"; // 权限判断指令
import checkPermission from "@/utils/permission"; // 权限判断函数
import SwitchRoles from "./components/SwitchRoles";

export default {
    name: "DirectivePermission",
    components: { SwitchRoles },
    directives: { permission },
    data() {
        return {
            key: 1 // 为了能每次切换权限的时候重新初始化指令
        };
    },
    methods: {
        checkPermission,
        handleRolesChange() {
            this.key++;
        }
    }
};
</script>

<style lang="scss" scoped>
.app-container {
  ::v-deep .permission-alert {
    width: 320px;
    margin-top: 15px;
    background-color: #f0f9eb;
    color: #67c23a;
    padding: 8px 16px;
    border-radius: 4px;
    display: inline-block;
  }
  ::v-deep .permission-sourceCode {
    margin-left: 15px;
  }
  ::v-deep .permission-tag {
    background-color: #ecf5ff;
  }
}
</style>

